3 Series E91 330xi (N52) TOUR
Heated washer jets
If a mirror memory has been fitted, the LIN bus takes over control of the footwell module (FRM).
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Bistable relay
The bistable relay is used to shut down terminal 30g-f if there is a closed-circuit current fault. Similar to the micro
power module (MPM), e.g. for E60 before 09/2005.
The relay is built in for certain options only (e.g. CCC, M-ASK, TCU, ULF). If a bistable relay is fitted, an
intelligent battery sensor will also be fitted.
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Functions for instrument cluster
The junction box electronics unit detects the following signals for the instrument cluster:
•
Fuel level sensor 1
•
Fuel level sensor 2
•
Coolant level
•
Parking brake warning switch
•
Washer fluid level
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Lock for second row of seats
> E70
The junction box electronics (JBE) monitor the locking of the second row of seats.
A total of 5 microswitches are fitted in the second row of seats. The microswitches are used to verify that the
second row of seats is correctly locked. The microswitches are wired in parallel directly with the junction box
electronics.
When the second row of seats is correctly locked, a signal is sent to the junction box electronics. If the signal is
not received, the second row of seats is not correctly locked. The junction box electronics sends a message on
the body CAN. The instrument cluster emits a Check-Control message.
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DTC button
The junction box electronics unit detects signals from the DTC button.
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Parking brake warning switch
The junction box electronics unit detects signals from the parking brake warning switch.
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Roller sunblind for rear window
The junction box electronics actuates the drive for the roller sunblind.
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Servotronic valve
On vehicles with Servotronic, the junction box electronics actuates the Servotronic valve (only on vehicles
without option 217 "Active Steering").
Cable connector
As well as its electronic function, the junction box electronics unit (JBE) also has a connector function. Many of the
wires from the 4 connectors that are connected to the junction box electronics are linked via the junction box
electronics. The connections optimise the wiring harness. Here, the junction box electronics work as a node.
Junction box electronics relays
The junction box electronics unit (JBE) has internal and external relays. The excitation coils on all relays are
permanently supplied with a positive cable. The positive power supply for the external relays is provided via the load
SBT Junction box E70, E71, E81, E82, E87, E90, E91, E92, E93
BMW AG - TIS
22.02.2013 01:43
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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